Sat Nav on my Android, good or bad idea?

[Tyre Smoke]

I have a Sony Xperia Z which is great but occasionally need to use a Sat Nav, but not enough to warrant buying one. My phone is always with me and therefore convenient.

I have used Google Maps before, which is okay as long as you are in a good signal area - not great in deepest darkest Devon and am currently coming to the end of a free month's trial of Wisepilot which I quite like. The smart thinking though seems be for CoPilot, which at £30 for Western Europe seems a bit steep, but does that include updates for life, or is there more to pay every so often? I like the idea of CoPilot not using your data allowance etc, which is good for foreign travel but I'm not exactly criss crossing Europe every week.

So, any advice?

[Tyre Smoke]

Which is Google Maps and rubbish in Devon. Unless you are in a biggish town or one of the cities, it's 2G everywhere. The data thing doesn't particularly concern me, because of the relative infrequency of use.

[Tyre Smoke]

Oooh! might give that a go.

Trouble with pre-loading maps, is often I don't know where I need to go until I have the person in my car.

[Tyre Smoke]

Will do, MapFactor being a pain to download.

[Tyre Smoke]

Gave up with Mapfactor, wouldn't load the maps. Using the free version of CoPilot at the moment, seems to be all I need and more.